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    The preamp board wired up. This is the original preamp board. The circuit was adding a simple reverb circuit that totally ruined the sound of the amp so later we bypassed and removed this part of the circuit. The third socket from the left and its associated circuitry were removed.

    The preamp board wired up. This is the original preamp board. The circuit was adding a simple reverb circuit that totally ruined the sound of the amp so later we bypassed and removed this part of the circuit. The third socket from the left and its associated circuitry were removed.

Univibing the Electro-Harmonix Small-Stone (’97)

Sometime in the late 70’s Rick Onslow – Frank Marino’s tech at the time – said to me that you could modify pretty much any four stage phase-shifter to make it sound somewhat like a Univibe … the key word here is “somewhat” for I haven’t set them to lie exactly where a Vibe has them set, rather I’m playing with the 10:1 decade ratio in two parts … I decided to first try this idea out that concept on the Small-Stone OTA-based circuitry though I’ve more recently done it on Op-amp based circuits, and those are matched to the Vibe response … recall that well-behaved “studio” phase shifters have their all-pass filter stages set to an identical shift frequency by using the same shifter cap value throughout …

via Univibing the Electro-Harmonix Small-Stone (’97).

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